All organisms need to transport substances into and out of their bodies.
Give two substances, other than oxygen, that a human must take into the body.
Urea is made in the liver.
Explain why urea must be removed from the body.
Name two substances that a plant takes in through its roots.
Amoeba is a single-celled organism that lives in pond water.
Describe how oxygen moves from the pond water into Amoeba.
42 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.